I think that you have your setting values set to "AUTO" in your BIOS which can cause hangs and post issues. The "Auto" setting, IMO, should only be used for the initial boot to get you into the BIOS so that you can then manually set the Frequencies, Voltages and memory Timings. Leaving the setting values set to "AUTO" allows the system to dynamically set these values at random and can cause instability if the system chooses an incorrect value or does not dynamically change the value fast enough to meet the performance need when you are actively using the system. This can really be a problem with your memory settings. Make sure that you copy down the values on that are on the sticker that is on the side of your RAM and enter those values in the BIOS exactly as they are spec'd on that sticker. Other items to check out.
* Do you have Cool and Quiet enabled, if so disable it and see if that helps.
* Check to see if you have your RAM configured for Ganged/Unganged, switch the value and try it running on the other for a while.
* Make sure if you have a ECC setting for your memory in your BIOS, that is is set to disabled as that also can cause issues with non-ECC spec'd RAM.
* Within the OS for your Power Option in your Control Panel, select high performance instead of Balanced or Power Saver, this will also stop throttling of your CPU freq and voltage.
Try cleaning your RAM sticks contacts with a pencil eraser, you may have some slight oxidation on a contact point that is not allowing the signal to pass through properly.
The opinions expressed above do not represent those of Advanced Micro Devices or any of their affiliates.